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Method for preparing polyamide nanofiltration membrane by interfacial polymerization process

An interfacial polymerization method and nanofiltration membrane technology, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc., can solve the problems of nanofiltration performance decline, poor chlorine resistance, polyamide structure damage, etc., and achieve mild conditions and preparation The effect of simple method and good chlorine resistance

Inactive Publication Date: 2020-02-07
QUZHOU RES INST OF ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current nanofiltration membrane is usually prepared by m-phenylenediamine and piperazine, which has the disadvantage of poor chlorine resistance. Due to the presence of β-H in the system, the amide group is easily attacked by Cl in the cleaning agent and rearranged, making The original dense polyamide structure is destroyed, resulting in a decrease in nanofiltration performance

Method used

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  • Method for preparing polyamide nanofiltration membrane by interfacial polymerization process
  • Method for preparing polyamide nanofiltration membrane by interfacial polymerization process

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The polysulfone (PSF) ultrafiltration membrane was immersed in 0.3wt% p-xylylenediamine aqueous solution with pH=12, taken out after 60s, and excess liquid was removed. After the surface of the PSF ultrafiltration membrane has no obvious water droplets, pour 0.35wt% TMC / cyclohexane solution on the surface of the PSF ultrafiltration membrane that absorbs saturated p-xylylenediamine molecules, and remove the oil phase solution after reacting for 150s to obtain Polyamide nanofiltration membrane. The obtained polyamide nanofiltration membrane was placed in an oven at 40° C. for 30 minutes to promote the subsequent polymerization reaction. Finally, the heat-treated nanofiltration membrane was stored in 1.5 wt% NaHSO 3 ready in solution.

Embodiment 2

[0026] The polysulfone (PSF) ultrafiltration membrane was immersed in 0.01wt% p-xylylenediamine aqueous solution with pH=12, taken out after 180s, and excess liquid was removed. After there is no obvious water drop on the surface of the PSF ultrafiltration membrane, pour 0.2wt% TMC / n-hexane solution on the surface of the PSF ultrafiltration membrane that absorbs saturated p-xylylenediamine molecules, and remove the oil phase solution after reacting for 1min to obtain poly Amide nanofiltration membrane. The obtained polyamide nanofiltration membrane was placed in an oven at 90° C. for 10 minutes to promote the subsequent polymerization reaction. Finally, the heat-treated nanofiltration membrane was stored in 1.5 wt% NaHSO 3 ready in solution.

Embodiment 3

[0028] The polysulfone (PSF) ultrafiltration membrane was immersed in 0.1wt% p-xylylenediamine aqueous solution with pH = 12, taken out after 120s, and excess liquid was removed. After the surface of the PSF ultrafiltration membrane has no obvious water droplets, pour 0.3wt% TMC / n-heptane solution on the surface of the PSF ultrafiltration membrane that absorbs saturated p-xylylenediamine molecules, and remove the oil phase solution after reacting for 30s to obtain Polyamide nanofiltration membrane. The obtained polyamide nanofiltration membrane was placed in an oven at 50° C. for 20 minutes to promote the subsequent polymerization reaction. Finally, the heat-treated nanofiltration membrane was stored in 1.5 wt% NaHSO 3 ready in solution.

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Abstract

The invention relates to the technical field of preparation of water treatment materials, in particular to a method for preparing a polyamide nanofiltration membrane by an interfacial polymerization process. The method comprises the following steps of immersing a polysulfone ultrafiltration membrane in a p-xylylenediamine aqueous solution, and performing soaking for enabling the surface of the polysulfone ultrafiltration membrane to perform saturation adsorption on p-xylylenediamine molecules; removing excess liquid after the polysulfone ultrafiltration membrane is taken out, so that the surface of the PSF ultrafiltration membrane is free of obvious liquid drops; pouring a trimesoyl chloride solution on the surface of the PSF ultrafiltration membrane, and removing an oil phase solution after a reaction to obtain a polyamide nanofiltration membrane; placing the polyamide nanofiltration membrane in an oven with the temperature of 40-90 DEG C for heat treatment to promote a subsequent polymerization reaction; and after the reaction is finished, immersing the nanofiltration membrane in an NaHSO3 solution for later use. The preparation method is simple and mild in condition; and the obtained nanofiltration membrane has excellent nanofiltration performance, the semi-aromatic amide structure of the nanofiltration membrane has good desalination performance and chlorine resistance, andthe requirements of seawater desalination treatment under various conditions can be met.

Description

technical field [0001] The invention belongs to the technical field of preparation of water treatment materials, and in particular relates to a preparation method of a polyamide nanofiltration membrane. Background technique [0002] With the development of industry and society, the shortage of water resources and water pollution have become important factors restricting social development. With the continuous growth of population, this problem will inevitably worsen. Therefore, developing sustainable high-efficiency technologies to treat existing water resources, such as developing seawater and brackish water desalination technologies, and strengthening wastewater treatment and reuse are important ways to solve water resource shortages and water pollution. Membrane separation technology has the advantages of high separation precision, environmental friendliness, low energy consumption, and simple operation, so it has shown broad application prospects in the field of water tr...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/12B01D61/02B01D71/56C02F1/44C02F103/08
CPCB01D61/027B01D69/125B01D71/56B01D2325/30C02F1/442C02F2103/08Y02A20/131
Inventor 张庆华李遨詹晓力陈丰秋程党国
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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